[Scheduled Apex] Example of a schedulable Apex job #salesforce #apex

DailyLeadProcessor.cls

global class DailyLeadProcessor implements Schedulable {
	
    global void execute(SchedulableContext context) {
        List<Lead> leads = [Select Id, LeadSource from Lead where LeadSource = null limit 200];
        for (Lead currentLead : leads) {
            currentLead.LeadSource = 'Dreamforce';
        }
        update leads;
    }
}

DailyLeadProcessorTest.cls

@IsTest
public class DailyLeadProcessorTest {

    @IsTest
    static void testLeadProcessor() {
    	final Integer recordCount = 200;
        final String cronExpression = '0 0 0 15 3 ? 2022';
        
        // Insert Lead records
        List<Lead> leads = new List<Lead>();
        for (Integer i = 0; i < recordCount; i++) {
            Lead newLead = new Lead(
            	FirstName = 'Test',
                LastName = 'Lead',
                Company = 'Company'
            );
            leads.add(newLead);
        }
        insert leads;
        
        // Run scheduled job
        Test.startTest();
        Id jobId = System.schedule('DailyLeadProcessor', cronExpression, new DailyLeadProcessor());
        Test.stopTest();
        
        // Verify result
        leads = [select Id, LeadSource from Lead];
        for (Lead currentLead : leads) {
            System.assertEquals('Dreamforce', currentLead.LeadSource);
        }
    }
}